Improving the light stability of perovskite solar cell with new hole transport material based on spiro[fluorene-9,9′-xanthene]

Springer Science and Business Media LLC
Huiming Luo1, Zheng Zhang1, Ligang Yuan1, Jiarong Wang1, Bin Li2, Sijing Wang2, Mojtaba Abdi‐Jalebi3, Lei Shi4, Wenjun Zhang4, Kunpeng Guo2, Liming Ding5, Keyou Yan1
1School of Environment and Energy, Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, South China University of Technology, Guangzhou 510000, China
2Ministry of Education Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, Taiyuan, 030024, Shanxi, China
3Institute for Materials Discovery, University College London, Malet Place, London WC1E 7JE, UK
4Hangzhou Zhongneng Photoelectricity Technology Co., Ltd., Hangzhou, 310018, China
5Center for Excellence in Nanoscience, Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing, 100190, P. R. China

Tóm tắt

AbstractDevelopment of suitable hole transport materials is vital for perovskite solar cells (PSCs) to diminish the energy barrier and minimize the potential loss. Here, a low-cost hole transport molecule named SFX-POCCF3 (23.72 $/g) is designed with a spiro[fluorene-9,9'-xanthene] (SFX) core and terminated by trifluoroethoxy units. Benefiting from the suitable energy level, high hole mobility, and better charge extraction and transport, the PSCs based on SFX-POCCF3 exhibit improved open-circuit voltage by 0.02 V, therefore, the PSC device based on SFX-POCCF3 exhibits a champion PCE of 21.48%, which is comparable with the control device of Spiro-OMeTAD (21.39%). More importantly, the SFX-POCCF3 based PSC possesses outstanding light stability, which retains 95% of the initial efficiency after about 1,000 h continuous light soaking, which is in accordance with the result continuous output at maximum power point. Whereas, Spiro-OMeTAD witnesses a rapid decrease to 80% of its original efficiency after 100 h light soaking. This work demonstrated that an efficient alignment of energy levels between HTL and perovskite will lead to significant highly efficient PSCs with remarkably enhanced light stability.

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